Refrigerating apparatus



y A. A. MccoRMAcK 2,124,234

REFRIGERATING APPARATU S Filed Nov. 30, 1934 INVENTOR.

15 v 415x ,4. W QWMCK ATTORNEY.

Patented Jab 119.1938

REFRIGERATING APPARATUS Alex A. McCormack, Dayton, Ohio, assignor to General Motors Corporation, Dayton, Ohio, a

corporation of Delaware Application November 30, 1934, Serial No. 755,384 6 Claims. (Cl. 330-139) This invention relates t orefrlgerating apparatus and more particularly to a. novel motor-compressor unit for use in a refrigerating apparatus of the compressor-condenser-evaporator type.

It is an object of the invention .to provide a motor-compressor unit having adjustable means for locating the main shaft of the unit whereby variations in machining parts of the mechanism occurring in the production as well as warpage caused by welding may be compensated.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanyingdrawing, wherein a preferred form of the present invention is clearly-shown.

In the drawing: I

There is shown a cross section of a motor-compressor unit embodying the present invention. and illustrating diagrammatically the essential elements of a complete refrigerating system.

Referring now to the drawing, there is shown a motor-compressor unit In having an outlet l2 from which compressed refrigerant is adapted to be delivered'to a condenser l4 by a conduit IS. The condenser l4 feeds liquefied refrigerant to a receiver l8, whence it is delivered by a conduit 26 to an expansion valve 22 for'expanding the refrigerant'into an'expansion coil-24. A conduit 26 delivers expanded refrigerant to the inlet 28 of the compressor III. A thermostatic switch 38 controls the motor-compressor unit It in accordance with the temperature of the expansion coil -24. The parts thus far described constitute the conventional elements of a refrigerating sys-: tem and are well knownin the art, it being understood the particular form of the elements zillustrated is merely representative of but one of the many forms of apparatus ofthis type with which the invention may be used.

The motor-compressor unit l8 comprises a housing 32 having an open bottom which is closed f by -a base member 34 which in turn is welded-to the housing 32 at ,36, to provide a hermetically sealed chamber 38. Within the chamber 38 in the upper portion thereof,,there is mounted'an electric motor comprising a stator 46 and a rotor 42. A hollow stationary shaft 441s located centrally of the housing 32 and mounted rigidly, as' by welding, in the base 34. A socket member 46 secured to the top of the housing 32 positions .the upper end 'of the shaft 44. A hollow compressor drive shaft v48 is journaled on the shaft.

44 carrying at its upperiportion the rotor 42,.

- while at the lower end, there is provided an cccentric journal. Secured to the base 341s a compressor body member which may comprise a bottom plate 52, a cylinder member 54, a valve cover plate 56 and a retainer plate 58. The parts 52 through 58 inclusive are rigidly secured together and to the base 54 and provide a cylindrical compression chamber 60 which is concentric to the axis of the shaft 44. The'cylinder member 54 is provided with a radial slot, not shown, for receiving a divider block in the well known manner. sion chamber 68 is a cylindrical impeller 62 which -.is journaled on the eccentric journal 50 and is adapted to revolve in the compression chamber charge orifice, not shown, communicates with the cdmpression space immediately adjacent the other side of the divider block as is wellknown in the art. The discharge orifice is provided with a flapper valve to prevent the return of high pres sure gas from the chamber 38'tothe chamber 60.

Communication between the chamber 38 and the outletponnection I2 is provided through the hollow shaft 44, and through one or moreapertures provided in the socket 46. A removable plug member 18 is provided in the base for charging the .unit with liquid refrigerant and lubricant.

Connections .to the motor are brought through the base" 34 by the sealed lead-in connections I2.

.Suitable lubricant retaining means 14 and 16 are provided at the top of the compressor to maintain a body of lubricant above the compressor head.

' In order to compensate for variations of dimensions pccurring in quantity production, and

for warpage caused by welding at 36, the socket member 46 is of special construction to provide for lateral adjustment. "This socket member 46 is provided with .a stepped internal bore 18 for receiving the upper end of the shaft 44. The shaft 44 is in turnformed with a portion of rieducedfldiameter and narrow in width which engages thesmallerportion of the bore 18 where- 'by misalignment between the bore 18 and the shaft 44 may be permitted. The socket member 46 is adjustably anchored to the housing member 32 by means of the bolt 82 passing through an aperture 84 in the housing 32. A rather large clearance is provided between'the bolt 82 and the aperture 84 in order to permit the required adjustability. A sealing. gasket '86 15 located Mounted withinthe compresaround the aperture 84 and coacts with an annular protuberance 88 on the under face of the bolt 82 to provide a hermetic seal when the bolt 82 is tight. An anchor member 90 is secured to one side of the socket member 46 and bent upwardly to enter a-recess 92 formed in the interior of the housing 32 for the purpose of preventing the socket member 46 from turning when the bolt 82 -is tightened. Large. clearances are also provided between the anchor member 90 and the recess 92.

The compressor unit is preferably assembled by first mounting the base plate 52 and the shaft 44 on the basemember 34 and rigidly securing them together, as by welding, preferably in a furnace having an atmosphere of hydrogen or other reducing gas. The charging plug fitting l0 and the inlet fitting 28 may also be welded to the base at the same time. The top surface of the plate 52 and bearing surfaces of the shaft 44 are then' accurately machined, after which the compressor body together with the rotary shaft 48, the rotor 42 and the impeller 62 are assembled to the base plate 52 and the shaft 44. The housing member 32 after the motor stator 40 is pressed therein is then pressed onto the base member 34 and welded at 36. Should there be any variations in thelateral position of the upper end of the shaft 44, the adjustable socket member 46 which is preferably loosely mounted to the housing 32 during assembly of the unit will move to whatever position is necessary so that it will position the upper end of the shaft 44 naturally and without binding any of the-parts of the compressor. The effects of any warpage caused by heat of. welding at 36 are also permitted to be compensated by leaving the bolt 82 untightened during thewelding operation. After this is completed, the bolt 82 is then tightened taking care to avoid laterally displacing the same. The socket member then becomes tightly anchored to, the housing member 32 and simultaneously a hermetic seal is formed between the gasket 86 and the protuberance 88 of the bolt 82. There results,

therefore, a compressor in which the parts are assembled in their natural relations withoutthe occurrence of warping or binding strains on any portions of the mechanism.

While the form of embodiment of the invention as herein disclosed constitutes a preferred form, it is to be understood that other forms P might be adopted, all coming within the scope of the claims which follow.

What is claimed is-as follows:

1. An adjustable shaft support for a hermetically sealed motor-compressor unit including a hermetically sealed housing comprising a socket joint forming member to secure ashaftwithinthe housing, adjusting means for securing the socket joint forming member to the housing in any of a plurality of positions of adjustment, said means extending through an aperture in the housing,

and means for sealing said securing means to the housing to seal said socket joint forming member and adjusting means to prevent passage of fluid between the interior and exterior of said hous- 2. An adjustable shaft support for a hermetically sealed motor-compressor-unit including a hermetically sealed housing comprising a socket joint forming member to secure a shaft within the housing, adjusting means for securing the socket joint forming member to the housing in any of a plurality of positions of adjustment, said means and means for sealing said securing means to the extending through an aperture in the housing,

housing to 'sealsaid socket joint forming member andadjusting means to prevent passage of fluid between the interior and exterior of said housing, said sealing meansand said securing means being rendered effective simultaneously.

3. A hermetically sealed motor-compressor unit comprising in combination a plate-like base member, an upright stationary shaft bonded to said base member, a dome-like housing assembled to said base member to form a hermetically sealed casing, a motor and compressor within s'aid casing and including a hollow rotary shaft journaled on said stationary shaft, said compressor including a cylinder secured to said base member and surrounding said stationary shaft and a laterally adjustable support within said casing for the upper end of said stationary shaft secured to the housing, said support having engagement with the stationary shaft through a limited distance axially of the shaft.

4. A hermetically sealed motor-compressor uni comprising in combination a plate-like base member,an upright stationary shaft rigidly secured to said base member, a dome-like housing assembled to said base member to form 'a hermetically sealed c'asing,'a motor and compressor within said casing and including a hollow rotary shaft journaled on said stationary shaft, said compressor including a cylinder'secured to said base member and surrounding said stationary shaft and a laterally adjustable support within said casing for the upper end of said stationary shaft secured to the housing, said support having engagement with the stationary shaft adjustably to secure said shaft after assembly of said housing and base member.

5. A hermetically sealed motor-compressor unit comprising in combination a relatively flat base member, an upright stationary shaft rigidly secu'red to said base member, a dome-like housing assembled to said base member to form a hermetically sealed casing, a motor and compressor within saidcasing and including ahollow rotary shaft journaled on said. stationary shaft, said compressor including a cylinder secured to said base member and surrounding said stationary shaft and a laterally adjustable support within said housing for the upper end of said stationary shaft and a threaded bolt extending through said casing into said support and having a head-' making sealing engagement with the exterior of said casing and sealing said member to said casing.

ALE}; A. McCORMACK. 

